when 'mysql', 'mysql2'
      sequel.gsub!(/!DB_DEVELOPMENT!/, "\"mysql2://localhost/#{db}_development\"")
      sequel.gsub!(/!DB_PRODUCTION!/, "\"mysql2://localhost/#{db}_production\"")
      sequel.gsub!(/!DB_TEST!/,"\"mysql2://localhost/#{db}_test\"")
      require_dependencies 'mysql2'